Actually, a Christian can have an indwelling demonic spirit- not in their spirit, but definitely in their body or soul, as sin call also thrive there. Many authors support this worldview, and my experience in a deliverance/inner healing ministry foe over 20 years supports this reality.
There are a few things in this book that I have a problem with. The one that stands out the most is the author saying that a Christian can have an indwelling demonic spirit. I don't see how that can be possible for the Holy Spirit cannot dwell with evil. For that reason alone I would not recommend this book for new Christians.
This book does a great job of explaining the Jezebel spirit, and how to combat it.
This is a book for the mature Christian. This book exposes every bit of character of this spirit. John Paul Jackson has hit it on the bulls eye. The Jezebel spirit is something that anyone should not take for granted.
It is real and it is roaming around on this earth. Educate yourself so you can know what to do.